MLF2012DR39KT000 Equivalent & Substitute Parts

Part Overview

The MLF2012DR39KT000 is a 390 nH shielded multilayer inductor manufactured by TDK Corporation, designed for surface mount applications in the 0805 (2012 Metric) package. This component operates at 200 mA current rating with a maximum DC resistance of 450 mOhm and is classified as Active product status. Substitute parts are identified when equivalent electrical performance and mechanical compatibility can be maintained across the specified parameter range, ensuring design continuity and supply chain flexibility.

Substiute Parts

MLF2012DR39KT000

TDK CorporationIn Stock: 1030MLF2012DR39KT000 Datasheet

Current PartRFQ

LQM21NNR39K10D

Murata ElectronicsIn Stock: 8398LQM21NNR39K10D Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the MLF2012DR39KT000 is determined by strict adherence to the following parameters:

Inductance value must be 390 nH with ±10% tolerance to maintain circuit performance. Current rating must be rated for minimum 200 mA to support the design load. DC resistance must not exceed the specified maximum to ensure acceptable power dissipation characteristics. Package and mounting type must be identical (0805 / 2012 Metric, Surface Mount) for mechanical and assembly compatibility. Shielding type must be shielded to maintain electromagnetic isolation. Core material must be ferrite to preserve frequency response characteristics. Component type must be multilayer inductor.

The substitute part LQM21NNR39K10D from Murata Electronics meets all these criteria and is therefore classified as an equivalent substitute.

Parameter Comparison

Engineering Selection Recommendations

Both the MLF2012DR39KT000 and LQM21NNR39K10D are Active product status components with full RoHS3 compliance and REACH unaffected status. The primary difference is DC resistance specification: the TDK part specifies 450 mOhm maximum while the Murata substitute specifies 530 mOhm maximum. This 80 mOhm difference represents approximately 18% higher resistance in the substitute part and must be evaluated against circuit power dissipation requirements. Operating temperature range differs, with the TDK part rated to -55°C and the Murata part to -40°C minimum; applications requiring extended low-temperature operation should retain the original TDK part. Self-resonant frequency differs by 15 MHz, which may impact high-frequency circuit behavior. Both parts maintain identical inductance, current rating, package dimensions, and compliance certifications.

Frequently Asked Questions (FAQ)

Q: Can the LQM21NNR39K10D replace the MLF2012DR39KT000 in all applications?

A: Substitution is valid when circuit design tolerates the higher DC resistance (530 mOhm vs 450 mOhm) and the narrower operating temperature range (-40°C to 85°C vs -55°C to 125°C). Applications requiring the full temperature range or lower power dissipation must use the original TDK part.

Q: Are the physical dimensions identical between these parts?

A: Yes. Both components are packaged in 0805 (2012 Metric) with identical length, width, and maximum seated height specifications. PCB footprints and assembly processes are interchangeable.

Q: What is the significance of the different self-resonant frequencies?

A: The MLF2012DR39KT000 has a self-resonant frequency of 180 MHz while the LQM21NNR39K10D is 165 MHz. This difference may affect inductor behavior at frequencies approaching these values. Circuit designs operating near or above 165 MHz should evaluate this parameter.

Q: Are both parts RoHS and REACH compliant?

A: Yes. Both the MLF2012DR39KT000 and LQM21NNR39K10D are ROHS3 compliant and REACH unaffected, meeting current environmental and regulatory requirements.

Q: What is the impact of the 80 mOhm DC resistance difference?

A: At 200 mA rated current, the TDK part dissipates 36 mW (450 mOhm × 0.2A²) while the Murata part dissipates 42.32 mW (530 mOhm × 0.2A²). This 6.32 mW difference is approximately 18% higher dissipation in the substitute part and should be considered in thermal budget calculations.